Abstract des Autors

A particular problem of self-reported dietary records is widespread under-reporting of energy intake regardless of the dietary assessment methods. However, under-reporting of dietary intakes in the Polish population has not been studied.
Aim of the study: This study was undertaken to determine the validity of self-reports in young sedentary and active male and female students. A total of 111 students (56 males and 55 females) with physical activity about 30 min per day were classified as sedentary (Group S). Subjects with physical activity at least 1 h per day (129 males and 120 females) were classified as active (Group A). The subjects’ macronutrient intake was briefly assessed from 24 h food records taken over 4 non-consecutive days and analyzed using computer program FOOD 2. The basal metabolic rate (BMR) was calculated from body fat and lean body mass and energy intake (EI) to BMR ratio was calculated to identify the under-reporters. In sedentary subjects the percent of under-reporters did not differ with respect to sex. In active subjects the percent of under-reporters was markedly higher in women than in men (P<0.001). The percent of under-reporters in active men was significantly higher vs. their sedentary counterparts (P<0.04). Moreover, in active women the percent of under-reporters was markedly higher than in all other groups (P<0.001). In sedentary women self-reported daily energy intake was significantly and inversely related to body fat (P<0.001). In active men the tendency (P<0.07) to lower self-reported energy intake with increasing body fat was noted. In contrast, neither in sedentary men nor in active women was self-reported energy intake associated with body fat. Our data indicate that physical activity has an adverse effect on the validity of self-reported dietary intake, especially in women. Increasing body fat stores adversely affected self-reports in sedentary women and active men. In sedentary men and active women other factors than body fat seem to affect under-reporting. Verf.-Referat